Remember when you learning about the "Least Common Multiple" and you wondered when in the world you would ever need to use it ? Well, here you are ! Hello !
The next time they will cross the starting line together is the LCM (Least Common Multiple) of 30 and 40 .
Do you remember how to find it ? Here's one easy way:
Count by 30s until you come to a number that's divisible by 40 .
Laura's first lap. . . . . . . . 30 seconds . . . not divisible by 40 Laura's two laps . . . . . . . 60 seconds . . . not divisible by 40 Laura's three laps. . . . . . 90 seconds . . . not divisible by 40 Laura's four laps. . . . . . 120 seconds . . . divisible by 40
After 120 seconds, Laura has completed four laps, Shelby has completed only three laps.
